You can now link your characters account to your main one. Use the drop down menu in the top right corner then go to profile, from there edit your profile, then go to Linked Accounts. Then begin adding from there. The dropdown menu in the top right is where you can find your linked accounts.

When transported to the Colosseum, a Pokemon Trainer will start their journey within a Pokemon Centre, Kwandrivia's largest to be exact. From there, two gates can be found, on leading to the Elite 3 and the other to the Battlegrounds. Only after gathering all 9 badges from the other gyms can one access the Elite 3 Road.